Well-insulated ducts operate at steady state with parameters as shown. The pressure is about 1 atm everywhere. Ignore potential and kinetic energy effects, take the dead state as 14.7 psi and 540°R, and assume ideal gas model for air with c, = 0.24 Btu/lb.°R. 2. I What are the mass flow rates for each state (1, 2, and 3), in lb/min? i What is the exit temperature, T3, in °F? 0] Find the rate of entropy production within the duct, in Btu/min-°R. a. b. c. d. Find the rate of exergy destruction within the duct during this process, in Btu/min. D = 4 ft V = 400 ft/min T = 80°F 3 V3 = 400 ft/min T3 = ? D3 = ? 2 (AV), = 2000 ft/min Vz = 600 ft/min T = 40°F Insulation Page 2 of 3

Well-insulated ducts operate at steady state with parameters as shown. The pressure is about 1 atm everywhere. Ignore potential and kinetic energy effects, take the dead state as 14.7 psi and 540°R, and assume ideal gas model for air with c, = 0.24 Btu/lb.°R. 2. I What are the mass flow rates for each state (1, 2, and 3), in lb/min? i What is the exit temperature, T3, in °F? 0] Find the rate of entropy production within the duct, in Btu/min-°R. a. b. c. d. Find the rate of exergy destruction within the duct during this process, in Btu/min. D = 4 ft V = 400 ft/min T = 80°F 3 V3 = 400 ft/min T3 = ? D3 = ? 2 (AV), = 2000 ft/min Vz = 600 ft/min T = 40°F Insulation Page 2 of 3

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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